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Electronic Dimmer Switches


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Hello there people!,

I recently thought of an idea, of designing a timer switch for my parents washroom. cuz, they leave the fan on and forget it.

Later i realized that there are switches like that in the market already! (my idea is outdated :) ) :D

Neways, Do you guyz know how these switches are created and designed? Like can somebody tell me the theory behind this timer switch ? For ex: like this one below:


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